应用同位素^（15）N研究栽培烟草土壤供氮能力

Studies on the Amounts of N Supply in Tobacco Soil With^(15)N Isotope.

１９８８～１９８９年应用^（１５）Ｎ标记研究硝酸铵施用在烟草土壤中的去向及土壤供氮能力。表明：硝酸铵利用率为１７％～２６％；损失大于４０％。六个田间试验微区结果：土壤全氮含量、碱解氮含量与“Ａ”值间呈显著相关；随海拔的升高，土壤供Ｎ量占全氮、碱解氮的比率显著减少。

Studies had been condueted to determine the amounts of N supply in tobacco soil with15N labeled ammonium nitrate in 1988-1989. The results Showed that the utilizable. rate of ammonium nitrate was 17%-26%, the surviving rate was 24%-36% and the loss rate was more than 40% in tobacco soil. The six experiments indicated that there was a marked correlation between the amounts of total N or alkalihydrolyzable N in soil and' A'. The ratio between the amounts of N supply and total N or alklihydrolyzable N yin soil was significant decline with elevation of altitude.